/**
 * Copyright &copy; 2017 <a href="https://gitee.com/hackempire/emsite-parent">emsite</a> All rights reserved.
 */
package com.empire.emsite.modules.sys.interceptor;

import java.text.SimpleDateFormat;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.NamedThreadLocal;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.empire.emsite.common.utils.DateUtils;
import com.empire.emsite.modules.sys.utils.LogUtils;

/**
 * 类LogInterceptor.java的实现描述：日志拦截器
 * 
 * @author arron 2017年10月30日 下午7:16:43
 */
public class LogInterceptor implements HandlerInterceptor {
    /**
     * 日志对象
     */
    protected Logger                       logger               = LoggerFactory.getLogger(getClass());
    private static final ThreadLocal<Long> startTimeThreadLocal = new NamedThreadLocal<Long>("ThreadLocal StartTime");

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (logger.isDebugEnabled()) {
            long beginTime = System.currentTimeMillis();//1、开始时间  
            startTimeThreadLocal.set(beginTime); //线程绑定变量（该数据只有当前请求的线程可见）  
            logger.debug("开始计时: {}  URI: {}", new SimpleDateFormat("hh:mm:ss.SSS").format(beginTime),
                    request.getRequestURI());
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {
        if (modelAndView != null) {
            logger.info("ViewName: " + modelAndView.getViewName());
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {

        // 保存日志
        LogUtils.saveLog(request, handler, ex, null);

        // 打印JVM信息。
        if (logger.isDebugEnabled()) {
            long beginTime = startTimeThreadLocal.get();//得到线程绑定的局部变量（开始时间）  
            long endTime = System.currentTimeMillis(); //2、结束时间  
            logger.debug("计时结束：{}  耗时：{}  URI: {}  最大内存: {}m  已分配内存: {}m  已分配内存中的剩余空间: {}m  最大可用内存: {}m",
                    new SimpleDateFormat("hh:mm:ss.SSS").format(endTime),
                    DateUtils.formatDateTime(endTime - beginTime), request.getRequestURI(), Runtime.getRuntime()
                            .maxMemory() / 1024 / 1024, Runtime.getRuntime().totalMemory() / 1024 / 1024, Runtime
                            .getRuntime().freeMemory() / 1024 / 1024, (Runtime.getRuntime().maxMemory()
                            - Runtime.getRuntime().totalMemory() + Runtime.getRuntime().freeMemory()) / 1024 / 1024);
            //删除线程变量中的数据，防止内存泄漏
            startTimeThreadLocal.remove();
        }

    }

}
